Catamaran airship



FIG. 1 is a top plan view of a catamaran airship showing my new design;

FIG. 2 is a right side elevational view of FIG. 1, this side is a mirror image of the left side;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a rear elevational view. 

CLAIM The ornamental design for a catamaran airship, as shown. 